Bilge pump



29, 1956 H. J. ATKINSON 2,747,513

BILGE PUMP Filed Jan. 10, 1955 2 Sheets-Sheet 1 y 29, 9 H. J. ATKINSON2,747,513

BILGE PUMP Filed Jan. 10, 1955 2 Sheets-Sheet 2 Fig. IO

]N VEN TOR.

HERBERT '3. ATKINSON Elwin a United States Patent BILGE PUMP Herbert J.Atkinson, Sudbury, Mass.

Appiicafion January 10, 1955, Serial No. 489,881

1 Claim. (Cl. 103-403) This invention relates to a pump especiallyadapted for the removal of bilge water from boats, but also useful forother general purposes.

It is the general object of this invention to provide a pump which isparticularly adapted for handling water or other liquids which containsubstantial amounts of sand, dirt or other waste material.

To the attainment of this general object, I provide a pump having asupplemental enclosing casing which is slotted to admit water or otherliquid but to exclude the coarser waste materials.

I also provide a pump in which all parts of the pump and easing are of aplastic material which is non-corrosive and impervious to water and alsoto all acids usually found in bilge water or in other similar wasteliquids.

In the preferred form of the invention, the plastic material istransparent, so that the operating condition of the pump may be readilyobserved. My improved pump is also so constructed that it may beentirely assembled or dismantled without the use of tools.

My invention further relates to arrangements and combinations of partswhich will be hereinafter described and more particularly set forth inthe appended claims.

A preferred form of the invention is shown in the drawings, in whichFig. 1 is a plan view of my improved pump, partly in section;

Fig. 2 is a cross sectional elevation, taken along the irregular line 22in Fig. 1;

Fig. 3 is a perspective view of the impeller;

Figs. 4, 5 and 6 are perspective views of lock rings;

Fig. 7 is a perspective view of a cover plate in the P p;

Fig. 8 is a side elevation of the top plate of the outer pump casing;

Fig. 9 is a partial sectional elevation, taken along the line 99 in Fig.2; and

Fig. 10 is a plan view of a ball which provides the foot bearing of theimpeller.

Referring to the drawings, my improved pump is assembled on arectangular base plate having a cylindrical outer casing or wall 22permanently mounted thereon. The casing 22 acts as a coarse strainer forthe pump and is provided with a plurality of relatively narrow slots 24which will admit water or other liquid but which will exclude coarserwaste material. Relatively fine sand or dirt will, however, pass throughthe slots 24.

A top plate 26 is provided for the casing 22 and this top plate is alsoslotted as indicated at 28 and 29, and

has a hub portion 30 having a bearing opening 31 for the impeller shaft33 (Fig. 3). A shoulder 34 on the shaft 33 prevents upward displacementof the impeller.

Impeller blades are firmly secured to the lower end of the shaft 33, andthe impeller rotates freely inside of an inner pump casing 42 which isentirely open at its upper face.

The lower end of the shaft 33 has a conical bearing opening 44 (Fig. 2),and the shaft 33 is supported by a ball 45 centered in a recess 46 inthe bottom plate 20. An axial opening 47 in the bottom of the recess 46prevents accumulation of dirt under the ball 45.

A top plate 50 (Fig. 7) has an axial opening 51 and is mounted in theinner casing 42. The plate 50 is held in vertical position by a pair ofspring rings 53 (Fig. 6) seated in annular grooves in the inner face ofthe casing 42. A similar spring ring 55 (Fig. 5) establishes thevertical position of the top plate 26, and an additional spring ring 57(Fig. 4) prevents upward displacement. The ring 57 has an up-turned endportion 58 for more convenient removal.

A discharge tube 60 is mounted on a lateral extension $2 of the innercasing and the space within this extension is freely open to theimpeller pump chamber as shown in Fig. 2.

The inclined position of the slots 24 and the angular position of theslots 28 and 29 in the cover plate 26 tend to retard the entrance ofcoarse waste material or to cause it to work down to the bottom of theouter casing.

It will be noted that ample clearance is provided outside of theimpeller blades 40 and also above and below the impeller blades, so thatthe pump is well adapted to the handling of sand, dirt, or other wastematerial without clogging.

The plastic construction prevents corrosion or acid action, and the useof transparent material facilitates inspection as previously described.

Having thus described my invention and the advantages thereof, I do notwish to be limited to the details herein disclosed, otherwise than asset forth in the claim, but what I claim is:

A bilge pump comprising an outer casing, an inner casing in the lowerpart only of said outer casing and substantially spaced therefrom andhaving an inner annular intake opening from the interior of said outercasing, an impeller rotatable in said inner casing, and an exhaustconnection from said inner casing, said outer casing having a slottedcylindrical side wall and having a manually-removable slotted top platewhich also provides a top bearing for the impeller.

References Cited in the file of this patent UNITED STATES PATENTS1,758,515 Heiermann May 13, 1930 2,318,786 Korte et al. May 11, 19432,649,051 Ericson Aug. 18, 1953 FOREIGN PATENTS 322,935 France Apr. 7,1902 386,432 Great Britain Ian. 19, 1933 OTHER REFERENCES BritishPlastics, The Moulding of Vinyl Chloride Polymers, pages 238-252, June1946.

